While Tuesday's political focus is on Wisconsin's presidential primary, California will have its turn in the state primary election on June 7.

People who are registered members of political parties will be able to take part. But for nonpartisan voters, it's a little more complicated.

The San Diego County Registrar of Voters sent out postcards to vote-by-mail non-partisan voters telling them their options if they want to vote in the presidential primary.

Voters who want to cast a ballot for Democratic, Libertarian or American Independent candidates must request a specific ballot by the deadline. Meanwhile, independent voters who want to participate in the Republican, Green or Peace and Freedom party primaries are required to reregister to vote. The deadline to make these changes is April 13.

San Diego elections that can be won in the primary by a vote of 50 percent plus one are now the subject of a reform effort.

The Independent Voter Project wants the city of San Diego to adopt the top two vote-getter system currently used by the state. That would mean that no candidate could win outright in the June primary. But it would take voter approval to make that change to the San Diego City Charter.

The Independent Voter Project will discuss their proposed charter reform with four of the five San Diego City Attorney candidates at an event on Tuesday from 6 p.m. to 8 p.m. at Lestat's West, 3341 Adams Ave. in Normal Heights.